Gallery, Projects and General > Gallery
What do you do when you're given some 1.25" aluminium Hex bar
SwarfnStuff:
Still looking great Joules, even down here in OZ.
Will follow with interest. :clap:
John B
Joules:
Thanks for the encouragement everyone. It makes a big difference being able to do this without work interruptions :clap: I wouldn't normally contemplate something like this.
The cylinder mandrel came together in about 20 minutes, so much for a couple of days thinking about it. So I set too and tested it with the Delrin cylinder, the fins for this cylinder are 0.5mm thick with a 0.5mm spacing. I had planned to grind up a Stanley blade to make the parting tool, but found a 0.5mm slitting saw. That was used in my 2MT tool post fixture as a multi blade parting tool.
Sadly the only way to photograph the Delrin is by over exposure, no fancy lighting here. I did use a macro lens on the phone for the close up. A little bit of aprehention when it comes to doing the brass cylinders, at least I have enough tips on the slitting saw to more than cover one tip per cylinder.
Still not found my stash of M2 fasteners, hoarded from hard drives and dead laptops over the years.
Joules:
It’s been a long day, but got my 6 brass cylinders machined externally. I needed to make a split clamp to hold my ER32 collet block directly on the mill table. This was the most accurate way to register the mandrel for all the cylinders to be drilled and tapped before transferring the mandrel onto the lathe for turning.
I used up some of my luck with the spare cylinder, and messed up one fin. The cylinder is OK for the rest of the processes and it has volunteered to go first. Lots more designing and making to do for this little engine.
SwarfnStuff:
Still interesting so please keep doing stuff. I really want to see this running some day.
Watching with interest.
John B :nrocks:
Joules:
A little bit of progress yesterday, getting the cylinder flange edges squared. I had intended to use my mandrel for these, but didn't have the reach with my small cutter, so they sat in Vee blocks with not the best clamping method, as they still needed a finger to stop them lifting from the up spiral of the cutter. I had to be very careful clamping them lightly to not distort things, hence boring to size will be the last operation on these cylinders.
Today is back at the CAD, getting the big end arrangement and con rods done. It all has to be tested for fit and clearance, I have tried a number of con rod permutations and still not happy, but this drawing is getting close. I took a punt on some cheap M2 bolts, they should be here in a week or so, I will check and test them before using on the engine to make sure the quality, is good enough !!!
Also on the todo list is a set of test pistons, they will be to check the motion, set the machining jig and set my stroke clearance, before commiting to the more complex, final parts.
LOL John B, you and me both.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version